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Figure 5 
(A) Estimates of abundance for ATI transient killer whales (Orcinus orca) in 
the Prince William Sound-Kenai Fjords study area; solid squares represent 
the posterior median for the estimated number of whales using the study 
area in each May-September period, N t , and bars represent the 95% prob- 
ability intervals. The broken horizontal line represents the trend given by a 
change-point model. (B) Posterior probability of a change in the abundance 
level in each year, characterizing the trend model. 
ment of 97km/day. Tagged GOA transients traveled 
as far offshore as 100 km and ranged from northern 
Kodiak Island to outside waters of southern southeast- 
ern Alaska (Fig. 7). The only areas used by the tagged 
whales in Prince William Sound were ocean entrances 
and Montague Strait. A single ATI killer whale was 
tracked for five days in 2010, and it traveled an aver- 
age distance of 95km/day. It moved offshore as far as 
45 km but did not leave the Kenai Fjords-Prince Wil- 
liam Sound area. It was the only tagged whale that 
traveled up into Prince William Sound, away from the 
ocean. The pattern of ATI transients using more inside 
waters in Prince William Sound and Kenai Fjords, and 
of GOA transients using ocean entrances, Montague 
Strait, and the outer coastlines of Kenai Fjords was 
also reflected in our encounter locations (Fig. IB). 
